On Tuesday, May 23, NASA astronauts Peggy Whitson and Jack Fischer will perform a critical computer data relay box replacement after a failure on May 20. You can watch the spacewalk live here, beginning at 6:30 a.m. EDT (1030 GMT). Watch our Preview Video | Full Story Preview: Space Station Astronauts to Take Surprise Spacewalk Tuesday to Replace Failed Computer Relay
The spacewalk is expected to last just two hours and begin at 8 a.m. EDT (1200 GMT), but Whitson and Fischer could start earlier if they run ahead of schedule, NASA officials said Sunday (May 23). During the spacewalk, the astronauts will replace a critical computer relay box, known as a multiplexer-demultiplexer (MDM), outside the space station on the outpost's S0 segment of its backbone-like main truss.
The MDM box, which was installed earlier this year in a March 30 spacewalk, failed on Saturday (May 20). A day later on Sunday, NASA mission managers okayed plans for a repair spacewalk.